Salma Bedhouche , Abdelmalek Boudries, Abdenour Yousfi

كلية العلوم الدقيقة-جامعة عبد الرحمان ميرة - بجاية · الجزائر

La sécurité des réseaux est une priorité absolue pour les entreprises. Sans une sécurité adéquate, les données d'une entreprise peuvent être compromises, avec des conséquences potentiellement catastrophiques. Aujourd'hui, de nombreuses entreprises sont victimes de plusieurs attaques et piratées en raison d'un manque de sécurité. Pour se protéger de ces attaques, les administrateurs réseau doivent mettre en place des stratégies et des mécanismes de sécurité plus solides dans leurs réseaux. Dans notre travail, nous avons intéressés par une proposition d'une configuration sécurisée basée sur le regroupement des VLANs, la sécurisation des ports (port-Security), ainsi protéger le domaine STP et empêcher les serveurs DHCP indésirables de se connecter sur notre réseau afin de pouvoir maximiser la protection du réseau de l'entreprise Cevital contre les menaces et les attaques possibles de l'atteindre.

Ahmad Khalil Soubra, Karim Rebeiz

كلية سليمان العليان لإدارة الأعمال -الجامعة الأمريكية في بيروت-الجامعة الأمريكية في بيروت · لبنان

Bassam Abu-Hijleh, Eman Mohammad Al-Madani

كلية الهندسة وتكنولوجيا المعلومات-الجامعة البريطانية في دبي · الامارات

It is expected that in the next few decades, CO2 production in the United Arab Emirates (UAE) will increase up to 138.4 million metric tonnes annually as a result of increasing the consumption of building resources, like energy and water (Radhi. 2009, p.2462). No matter how big or small buildings are, they still contribute to the accumulation of greenhouse gases (GHG) in the atmosphere as well as the consumption of resources. One of the challenges and misconceptions that slow down the spreading of “greening existing buildings” concept is that many, including building professionals, still believe that is it very costly to sustainably renovate buildings (Nelson. 2010).The UAE has recently started to develop policies and guidelines to encourage the application of green building strategies for new contraction; however, little attention has been given to the existing buildings. That is why this paper focused its research on the concept of greening existing buildings in the UAE. It takes Dubai Chamber of Commerce and Industry’s headquarter building as a case study example of an existing building that turned green. It then explores the applicability of learning from Dubai Chamber’s experience in an aim to green other existing buildings in the UAE.The research concludes that existing buildings in the UAE can easily be greened as well as save costs and sustain resources at the same. Although buildings are not alike in terms of the systems they use and the ways they operate, understanding what is available and how they function are important to identify improvement opportunities and achieve the their green building goals.

محمد أحمد فرحان الجميلي , مقداد أحمد نوري

كلية الادارة والاقتصاد-جامعة بغداد · العراق

Alexis Nzila , أجيبولا حكيم اوكيودي

كلية الكيميائيات والمواد-جامعة الملك فهد للبترول والمعادن · السعودية

Petroleum pollutants have been a major concern in recent years. Among the most important petroleum pollutants are polycyclic aromatic hydrocarbons (PAH). Generally, PAHs are cyclic aromatic hydrocarbons with fused benzene rings ranging from 2 rings and above. Coronene, one of the most complex PAHs is the least studied probably due to its high recalcitrance. In this study, we focus on isolating bacteria that can actively degrade coronene using bioremediation. A bacterial strain, capable of degrading coronene as the only source of carbon was isolated by enrichment of soil-contained inoculum, in a mineral culture medium, in the presence of coronene as the only source of carbon, and salinity at 10% NaCl. This enrichment led to the isolation of the 10SCRN4D strain, and 16S RNA gene sequencing and homology analyses have indicated that this strain belongs to the Halomonas caseinilytica species. The growth rate of this bacterial strain in the presence of coronene was carried out at varying temperatures (30oC, 37 oC and 50 oC), concentrations (5ppm, 25ppm and 50ppm) and pH (3.0, 7.0 and 10.0), salinity (0.5, 10, 20% w/v of NaCl), and the data presented as doubling time (dt). The results indicate pH 7, 30oC and 0.5 % NaCl is the optimum growth condition, characterized by the lowest dt (thus highest growth) of 8.78 hrs. As expected, an increase in coronene concentration led to an increase in doubling time (decrease in growth), from 11.13hrs at 10ppm to 15.71 hrs at 50 ppm. The effect of time variation on the bacterial degradation of coronene was also investigated for a period of 80 days. More than 45% of coronene was degraded on day 40 while 75% of coronene was degraded on day 80, which attests to the fact that the degradation rate increases with the increased duration of the experiment. Thus, the 10SCRN4D strain is a unique halotolerant halophilic bacterium that can grow and degrade in the presence of 7-ring PAH coronene with up to 75% degradation as demonstrated by our study

عباسة الطاهر, لرول عبد القادر

كلية الحقوق والعلوم السياسية-جامعة عبد الحميد بن باديس مستغانم · الجزائر

Bachir Sahed, Fethi Ben Khelifa, Yacine Touahria

كلية الاداب واللغات-جامعة محمد بوضياف - المسيلة · الجزائر

Nadia Belghali, Assia Bouzid, Hadjer Brahmi

كلية الآداب واللغات والعلوم الاجتماعية-جامعة عين تموشنت - بلحاج شعيب · الجزائر

Creativity is the effort made by an individual that gives his/her product originality and significance. Many researches have been conducted to emphasize the role of creativity in fostering the critical thinking of learners and their perception of matters surrounding them. However, very few studies have inquired the effect of creativity on the teacher and his/her impact on the learners. Hence, The aim of the current research is to find a way for the application of the investment theory of creativity by the teachers of the English Department, Belhedj Bouchaib University Centre of of Ain Temouchent . It also aims at setting clearly how positive its impact will be on the learners concerning their learning and achievements. The present research is a case study which involves two tools of data collection; a semi-structured questionnaire was addressed to third year English students and first year master students, a semi-structured interview was conducted with the teachers of the English department of Belhedj Bouchaib University Centre of of Ain Temouchent. The data were quantitatively and qualitatively analyzed. The analysis of previous data collection tools disclosed that the investment theory of creativity could positively affect the teacher’s performance, and has an impact on his/her learners, if he stood up on the six resources of Sternberg’s theory as a daily basis. The conclusions shows that the investment theory of creativity can be used as multi-tasks tool for having a diverse set of six resources that enables the teachers to foster their creativity level and extent. Therefore, the teachers should dedicate a considerable emphasis for its application with reference to the different circumstances and situations that they may encounter.

Marwah Ahmed Tawfic , Ishraq Bashir Mohammed El-Hassan

كلية الدراسات العليا-جامعة وادي النيل · السودان

This research is an experimental study which aims at knowing the impact of applying Task – Based Approach to EFL beginners. The main focus of the study is to examine the achievement level of students in the four major language skills as well as students' attitudes towards studying English. Sixty first- year intermediate EFL students participated in this experiment. They were chosen randomly. Then, they were randomly assigned to two groups: the experimental and the controlled groups. Each group consisted of 30 students. The controlled group studied the English course according to the Communicative Approach .On the other hand; the experimental group studied the same English course according to the Task-Based Approach. The experiment lasted for two terms (i.e. The academic year 2004-2005) the two groups were taught by the same English teacher. To answer the research questions, the researcher has used three tools (i.e. the achievement test, the students' questionnaire and the interview with a number of methodologists and experts.) Later, the required data were analyzed statistically. The finding of data analysis revealed that the experimental group has surpassed the controlled group not only in the achievement test but also in their attitudes towards studying English. Therefore, it is concluded that Task – Based Approach is considered to be more effective than the Communication Approach in developing the four major language skills as well as in improving students' attitudes towards studying English. Finally, the research ends with recommendations for improving students' attitudes towards studying English. In addition, the researcher recommends that further study should be made in order to discover & identify the obstacles that hinder the application of Task- Based Approach in our schools

حمزة مكناز , حيزية بن الابقع, معيزة عيسى

كلية الحقوق والعلوم السياسية-جامعة زيان عاشور - الجلفة · الجزائر